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PDFtk or The PDF Toolkit is an open source cross-platform tool for manipulating PDF documents. pdftk is basically a front end to the iText library (compiled to Native code using GCJ), capable of splitting, merging, encrypting, decrypting, uncompressing, recompressing, and repairing PDFs.

If pdf is electronic paper, then pdftk is an electronic stapler-remover, hole-punch, binder, secret-decoder-ring, and x-ray-glasses.
pdftk is a simple tool for doing everyday things with pdf documents. keep one in the top drawer of your desktop and use it to: